Theoretical Analysis of the Inorganic Perovskite/Gallium Arsenide Tandem Solar Cell for Efficiency Improvement

The perovskite/gallium arsenide (CsPbI<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>Br/GaAs) based tandem solar cell (TSC) can improve the efficiency as compared with single junction SCs. In recent studies on perovskite/GaAs TSC lags theoretical analysis to improve the efficiency, and it attributes the current matching conditions between the sub cells. In this study, we modelled the 2-terminal (2-T) monolithic perovskite/GaAs TSC using the SCAPS-1D software. CsPbI<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>Br based perovskite solar cell (PSC) and GaAs based SC proposed as top and bottom (T&B) cells in tandem configuration. Recombination and bulk/interfacial defect parameters are also included in the layers for mimicing the real phenomenon of the device physics. After optimization of the sub cells, we achieved the improved performance of TSC as compared to the standalone sub cells. Studied TSC achieved the J<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sc</inf> of 14.43 mA/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>, V<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">oc</inf> of 2.48 V, FF of 84.91 % and PCE of 30.38 % and standalone (T&B) cells exhibited PCE of 18.74 % and 11.75% respectively under TSC configuration. This theoretical approach offers a way to develop the perovskite/GaAs based TSCs for higher efficiency and it can be applicable for space application.